Notes on NAAMM Code of Standard Practice

NAAMM AMP 555-92
Code of Standard Practice for the Architectural Metal Industry

My recommended reading list has several NAAMM specifications listed. This month I read the NAAMM code of standard practice, which is available as a free download and is a quick read at 40 pages.

The key points that stood out to me are listed below. All notes are paraphrases or snippets and quotes from larger sections. I suggest reading through the entire code to get a basic familiarity with the requirements of this code.

Section 1. General Provisions

1.3 Responsibility for Design

The architect/engineer is responsible for suitability, adequacy and legality of all aspects of design in the plans and specifications.

Section 2. Classification of Materials

2.1 Definition of Architectural Metal

Lists what items are classified as architectural.

2.2 Other Metal Items

Lists what items are not classified as architectural.

Section 3. Plans and Specifications

3.3 Limit of responsibility

Know your limits of responsibility as a fabricator.

3.5 Discrepancies

Understanding which drawings take precedence.

Specifications over drawings.

Architectural drawings over structural drawings.

Section 4. Shop and Erection Drawings

4.2 Fabrication Drawings

Embedded items are to be submitted before other detailed items.

4.3 Erection Drawings

4.3.3 for items such as lintels, schedules may be provided. Useful for bollards, hose racks, etc.

4.5 Approval

Read to understand the approval process, requirements, changes, and allowable schedule for submittal review.

4.6 Responsibility

Know the limits of responsibility of the approval process for the reviewer and the fabricator. Per this standard, approval of shop drawings indicates that the fabricator has correctly interpreted the contract requirements.

Section 5. Materials

5.1 Mill Materials

5.1.1 The owner must request MTR in writing prior to the time the fabricator places his orders with the mill.

5.2 Stock Materials

5.2.2 The fabricator does not maintain records that identify individual pieces of stock material against individual test reports. Not required if the fabricator purchases materials for stock under established specifications.

Section 6. Fabrication and Delivery

6.4 Dimensional Tolerances

6.4.1 There are no standard tolerances since tolerances very with products. Normal manufacturing tolerances are allowable.

6.4.2 Guaranteed field dimensions should be furnished by the Contractor.

6.5 Shop Painting – Steel

6.5.2 The fabricator is not responsible for deterioration of the prime coat that may result from extended exposure to ordinary atmospheric conditions.

6.5.3 The fabricator’s workmanship on surface preparation is considered accepted by the owner unless specifically disapproved prior to paint application.

6.5.5 Abrasions caused by handling after painting are to be expected.

6.6 Special Finishes – Including Zinc Coatings

References to see the Metal Finishes Manual

6.7 Delivery of Materials

6.7.2 The owner must give the fabricator sufficient time to fabricate and ship materials before they are needed.

6.7.4 The receiving party is responsible to notify the fabricator of any damaged material prior to unloading or immediately upon discovery.

Section 7. Erection and Installation

7.6 Correction of Errors

It may be necessary in some instances to correct misfits by moderate amounts of field corrections such as reaming, chipping, welding and/or cutting.

7.7 Handing and Storage

7.7.1 & 7.7.2 The owner, or representative, is responsible for avoiding damage and/or accumulation of dirt and foreign matter on material delivered to the jobsite.

7.7.3 The owner is responsible for promptly protecting architectural items after installation.

7.8 Field Painting

The owner is responsible for field painting, including bolt heads and nuts, field welds and touch-up of the shop coat.

Section 8. Quality Control or Assurance

8.1 General

Both fabricator and erector are to maintain a quality control program to the extent deemed necessary so that work is performed in accordance with the Code and contract documents.

8.2 Material Inspection

If the owner desires additional material acceptance procedures beyond the mill test reports, it must be specified in the contract documents.

8.3 Workmanship

Products are fabricated to Class 1, 2 or 3. This section contains a details of each class. Class 1 (architectural metals) has the highest requirements with class 3 having the least.

8.4 Sitework

8.4.1 Field Measurements

Where taking field measurements before fabrication might delay the project, allowance is made for trimming and fitting in the field.

8.4.2 Assembly

Degree of assembly is at the discretion of the fabricator in coordination with the erector.

Section 9. Contracts

9.1 Types of Contracts

Details on three types of contracts including lump sum payments, price per item payments and unit price payments.

9.2 and 9.3

Information on revisions to contract documents (change orders) and contract price adjustments.

9.4 Scheduling

9.4.2 The contractor is responsible to review the construction schedule with the fabricator and erector prior to commencing work and to incorporate their specific scheduling requirements into the construction schedule.

9.4.3 All parties (fabricator, erector, contractor) are responsible to advise each other, in a timely manner, of the effect any revision has on the schedule. The contractor is to advise the fabricator of the effect any revision has on areas of the schedule that directly or indirectly impact the progress of the architectural metal work.

9.4.4 The fabricator and erector are compensated for additional costs incurred if the fabrication or erection is delayed significantly due to design revisions or other reasons attributed to the owner or other parties.

9.4.6 Delivery date is directly related to receipt of field dimensions.

Section 10. Finishes

10.1 Scope

This section does not apply to standard shop applied primers. See section 6.5.

Commentary on the Code of Standard Practice

Section C1. General Provisions

C1.1 Scope

This Code is for architectural metals only and is not applicable to AISC, MBMA and SJI.

C1.3 Responsibility for Design

This fabricator is not responsible for design.

The responsibility of the safety and design of the complete structure is the responsibility of the EOR and this responsibility is non-delegable. References to an AISC letter and court decision.

Section C2. Classification of Materials

C2.1.1 Metal Fabrications or Miscellaneous Metals

List of standard applicable stair types:

  • Straight stairs – all classes
  • Circular stairs – usually architectural but may be commercial, service or industrial
  • Curved stairs – architectural class only and always specially designed
  • Spiral stairs – usually service or industrial class but may be residential, commercial or architectural

The class designation of stairs is a key to the type of construction, quality of materials, details and finish.

List of standard stair classes:

  • Industrial Class
    • Welds are not ground
  • Service Class
    • Only welds in the travel area are smooth
  • Commercial Class
    • Welds in conspicuous locations are smooth and all joints are closely fitted
  • Architectural Class
    • Exposed welds are smooth

Stair components may be field assembled at the job site or pre-assembled at the plant.

C2.1.2 Sheet Metal Fabrication

General notes and information about standard sheet metal fabrication, materials and fabrication processes.

C2.1.3 Ornamental Metal

Typically utilized for architectural decorative effects, provides an opportunity for imaginative and attractive designs.

Requires careful workmanship with skill and knowledge of specialized manufacturing techniques.

Usually installed after primary construction of the building is complete.

C2.1.5 Other Metal Fabrications

Contains a full two page alphabetical list of various types of metal fabrications that could be included in this code.

Section C3. Plans and Specifications

C3.7.2 Metal Fabrications or Miscellaneous Metals

When samples and mock-ups  are not satisfactory to the owner. If they have been fabricated correctly per the design. The cost of further developing items to the owner’s satisfaction is borne by the owner.

Section C8. Quality Control

C8.3 Workmanship

Caution should be used in specifying the level of workmanship required. Class 3 is all that is required in many cases and is the lowest cost level of workmanship. Class 1 & 2 are the highest cost and should only be specified when appearance is critical.

Section C10. Finishes

The function of metal finishes may be protective, decorative or both.

Hope you found this helpful. Take a look at my recommended reading list for links to additional resources, most of which are available for free.

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